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Facebook's Mark Zuckerberg marries sweetheart

In this July 9, 2011, file photo, Mark Zuckerberg, president and CEO of Facebook, walks to morning sessions with his girlfriend Priscilla Chan during the 2011 Allen and Co. Sun Valley Conference, in Sun Valley, Idaho. On Saturday, May, 19, 2012, Zuckerberg and Chan tied the knot at a small ceremony at his Palo Alto, Calif., home, capping a busy week for the couple (AP Photo/Julie Jacobson)

In this Feb. 5, 2007 file photo, Facebook CEO Mark Zuckerberg poses at his office in Palo Alto, Calif. Zuckerberg turns 28 on Monday, May 14, 2012. He's considerably younger than the average FORTUNE 500 CEO, of course. But while some investors worry that Zuckerberg is too young to lead Facebook as a public company, experts point out that Bill Gates, Steve Jobs and Michael Dell were in their 20s when their companies had IPOs. (AP Photo/Paul Sakuma, File)

Zuckerberg and 27-year-old Priscilla Chan tied the knot at a small ceremony at his Palo Alto, Calif., home, capping a busy week for the couple.

Zuckerberg took his company public in one of the most anticipated stock offerings in Wall Street history Friday. And Chan graduated from medical school at the University of California, San Francisco, on Monday, the same day Zuckerberg turned 28.

The couple met at Harvard and have been together for more than nine years.

A source authorized by the couple to speak said Zuckerberg designed the ring featuring "a very simple ruby."

The ceremony took place in Zuckerberg's backyard before fewer than 100 guests, who all thought they were there to celebrate Chan's graduation.

Even after the IPO, Zuckerberg remains Facebook's single largest shareholder, with 503.6 million shares. And he controls the company with 56 percent of its voting stock.

The site, which was born in a dorm room eight years ago, has grown into a worldwide network of almost a billion people.